In some fonts I have noticed a problem I can not correct. I have drawn all the characters in the lower case properly, but when generated into a font some of the characters display in a rather distorted way, dependant on character size displaying.
It usually happens to the lower r, n, h. sometimes the a or the s.

Larger displayed sized the problem goes away, but it also seemt to happen in documents.
Even though my explanation is confusing, does anyone have an idea what is wrong.

I have attached an image someone has supplied me with to illustrate the problem

Postscript Autohinting is far away from perfect. If you take a look at some other fonts you notice that these kind of problems are almost always there, more or less anyway.

I’ve experimented a lot with this lately and found out that if you only autohint the vertical stems, it can sometimes can work very good – you get sharper appearance on screen but this typical horizontal distorsion is not there (when letters jump up and down).

PS. Just to give you more examples: I also spotted the same issue on another thread lately that don’t really speaks about hints, but as an example – look at the "t", "u" and "e" on Freight Micro Bold on this thread:

Mr Twardoch
Thanks for your observations and suggestions. I got home and went to fix up the original font file here with your suggestions, and got absolutely nowhere. I followed your steps four times and the problem persisted every time.
Whipped out Fontographer and autohinted. Problem still slightly there so started over with Fontographer. 1. automated vert align zones then 2 . Autohinted. Problem cleared up. Could be just this font of mine, but confused an out of date program fixed the problem while Fontlab seems to stutter on it.

Out of pure stubborness, took the corrected font and in Fontlab, followed your steps again. It recreated all the visual problems in the corrected font.